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package util;

import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import model.ShoppingCart;

/**
 *
 * @author SONY
 */
public class CheckOrderFilter implements Filter {
    
    private static final boolean debug = true;
    // The filter configuration object we are associated with.  If
    // this value is null, this filter instance is not currently
    // configured. 
    private FilterConfig filterConfig = null;
    
    public CheckOrderFilter() {
    }    
    
    private void doBeforeProcessing(ServletRequest request, ServletResponse response)
            throws IOException, ServletException {
        if (debug) {
            log("CheckOrderFilter:DoBeforeProcessing");
        }

        // Write code here to process the request and/or response before
        // the rest of the filter chain is invoked.

        // For example, a logging filter might log items on the request object,
        // such as the parameters.
	/*
         for (Enumeration en = request.getParameterNames(); en.hasMoreElements(); ) {
         String name = (String)en.nextElement();
         String values[] = request.getParameterValues(name);
         int n = values.length;
         StringBuffer buf = new StringBuffer();
         buf.append(name);
         buf.append("=");
         for(int i=0; i < n; i++) {
         buf.append(values[i]);
         if (i < n-1)
         buf.append(",");
         }
         log(buf.toString());
         }
         */
    }    
    
    private void doAfterProcessing(ServletRequest request, ServletResponse response)
            throws IOException, ServletException {
        if (debug) {
            log("CheckOrderFilter:DoAfterProcessing");
        }

        // Write code here to process the request and/or response after
        // the rest of the filter chain is invoked.

        // For example, a logging filter might log the attributes on the
        // request object after the request has been processed. 
	/*
         for (Enumeration en = request.getAttributeNames(); en.hasMoreElements(); ) {
         String name = (String)en.nextElement();
         Object value = request.getAttribute(name);
         log("attribute: " + name + "=" + value.toString());

         }
         */

        // For example, a filter might append something to the response.
	/*
         PrintWriter respOut = new PrintWriter(response.getWriter());
         respOut.println("<P><B>This has been appended by an intrusive filter.</B>");
         */
    }

    /**
     *
     * @param request The servlet request we are processing
     * @param response The servlet response we are creating
     * @param chain The filter chain we are processing
     *
     * @exception IOException if an input/output error occurs
     * @exception ServletException if a servlet error occurs
     */
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain)
            throws IOException, ServletException {
        try {
            if (request instanceof HttpServletRequest) {
                HttpServletRequest http_request = (HttpServletRequest) request;
                ShoppingCart shopping_cart = (ShoppingCart) http_request.getSession().getAttribute("shopping_cart");
                if (http_request.getServletPath().startsWith("/nonmember/order_step1.jsp")) {
                    if ((shopping_cart.getQuantityItemCart() > 0) && (http_request.getSession().getAttribute("user_member") != null)) {
                        this.filterConfig.getServletContext().getRequestDispatcher("/nonmember/order_step2.jsp").forward(request, response);
                        return;
                    } 
                    if ((shopping_cart.getQuantityItemCart() > 0) && (http_request.getSession().getAttribute("user_member") == null)) {
                        this.filterConfig.getServletContext().getRequestDispatcher("/nonmember/order_step1.jsp").forward(request, response);
                        return;
                    }
                    if ((shopping_cart.getQuantityItemCart() <= 0)) {
                        this.filterConfig.getServletContext().getRequestDispatcher("/nonmember/cart.jsp").forward(request, response);
                        return;
                    }
                }
                if (http_request.getServletPath().startsWith("/nonmember/order_step2.jsp")) {
                    if ((shopping_cart.getQuantityItemCart() > 0)) {
                        this.filterConfig.getServletContext().getRequestDispatcher("/nonmember/order_step2.jsp").forward(request, response);
                        return;
                    } else {
                        this.filterConfig.getServletContext().getRequestDispatcher("/nonmember/cart.jsp").forward(request, response);
                        return;
                    }
                }
                if (http_request.getServletPath().startsWith("/nonmember/order_step3.jsp")) {
                    if ((shopping_cart.getQuantityItemCart() > 0) && (request.getAttribute("Name") != null) && (request.getAttribute("Address") != null) 
                            && (request.getAttribute("Phone") != null) && (request.getAttribute("PaymentType") != null)) {
                        this.filterConfig.getServletContext().getRequestDispatcher("/nonmember/order_step3.jsp").forward(request, response);
                        return;
                    } else {
                        this.filterConfig.getServletContext().getRequestDispatcher("/nonmember/cart.jsp").forward(request, response);
                        return;
                    }
                }
                if (http_request.getServletPath().startsWith("/nonmember/payment.jsp")) {
                    if ((shopping_cart.getQuantityItemCart() > 0) && (request.getAttribute("Name") != null) && (request.getAttribute("Address") != null) 
                            && (request.getAttribute("Phone") != null)) {
                        this.filterConfig.getServletContext().getRequestDispatcher("/nonmember/payment.jsp").forward(request, response);
                        return;
                    } else {
                        this.filterConfig.getServletContext().getRequestDispatcher("/nonmember/cart.jsp").forward(request, response);
                        return;
                    }
                } 
                if(http_request.getServletPath().startsWith("/nonmember/list_products.jsp")) {
                    if(http_request.getSession().getAttribute("lstproducts") == null) {
                        this.filterConfig.getServletContext().getRequestDispatcher("/nonmember/list_products.do").forward(request, response);
                        return;
                    }
                }
            }
            chain.doFilter(request, response);
        } catch (Exception e) {
            System.err.println(e);
        }
    }

    /**
     * Return the filter configuration object for this filter.
     */
    public FilterConfig getFilterConfig() {
        return (this.filterConfig);
    }

    /**
     * Set the filter configuration object for this filter.
     *
     * @param filterConfig The filter configuration object
     */
    public void setFilterConfig(FilterConfig filterConfig) {
        this.filterConfig = filterConfig;
    }

    /**
     * Destroy method for this filter
     */
    public void destroy() {        
    }

    /**
     * Init method for this filter
     */
    public void init(FilterConfig filterConfig) {        
        this.filterConfig = filterConfig;
        if (filterConfig != null) {
            if (debug) {                
                log("CheckOrderFilter:Initializing filter");
            }
        }
    }

    /**
     * Return a String representation of this object.
     */
    @Override
    public String toString() {
        if (filterConfig == null) {
            return ("CheckOrderFilter()");
        }
        StringBuffer sb = new StringBuffer("CheckOrderFilter(");
        sb.append(filterConfig);
        sb.append(")");
        return (sb.toString());
    }
    
    private void sendProcessingError(Throwable t, ServletResponse response) {
        String stackTrace = getStackTrace(t);        
        
        if (stackTrace != null && !stackTrace.equals("")) {
            try {
                response.setContentType("text/html");
                PrintStream ps = new PrintStream(response.getOutputStream());
                PrintWriter pw = new PrintWriter(ps);                
                pw.print("<html>\n<head>\n<title>Error</title>\n</head>\n<body>\n"); //NOI18N

                // PENDING! Localize this for next official release
                pw.print("<h1>The resource did not process correctly</h1>\n<pre>\n");                
                pw.print(stackTrace);                
                pw.print("</pre></body>\n</html>"); //NOI18N
                pw.close();
                ps.close();
                response.getOutputStream().close();
            } catch (Exception ex) {
            }
        } else {
            try {
                PrintStream ps = new PrintStream(response.getOutputStream());
                t.printStackTrace(ps);
                ps.close();
                response.getOutputStream().close();
            } catch (Exception ex) {
            }
        }
    }
    
    public static String getStackTrace(Throwable t) {
        String stackTrace = null;
        try {
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            t.printStackTrace(pw);
            pw.close();
            sw.close();
            stackTrace = sw.getBuffer().toString();
        } catch (Exception ex) {
        }
        return stackTrace;
    }
    
    public void log(String msg) {
        filterConfig.getServletContext().log(msg);        
    }
}
